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IP Toolbox: Subnet Analyzer, VLSM, Route Summarization

Free – no sign-upRuns in your browser

Free IP toolbox: analyze subnets, detect overlaps and duplicates, summarize routes, split subnets / VLSM and extract IPs from any text.

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Paste any list of IPs and subnets – including "IP MASK" format – and get clean analysis instantly.

What it does

How it works

1. Load your dataPasted IP / subnet lists – drag & drop anywhere on the page; the file type is detected automatically.
2. Review the findingsEvery error and warning is clickable and jumps to the exact row, line or parameter, with a proposed fix.
3. Export & shareExcel, PDF and other exports; run history and before / after comparison are kept on your computer.

FAQ

Is my data uploaded to a server?

No. Files are processed in your browser (or by the optional helper app on your own computer). Nothing is stored on our servers.

Do I need to install anything?

No – it is a web app. You can optionally install it as a desktop app from the browser. A small helper app is only needed for tools that must reach your network (ping, port check, auto login).

Is it really free?

Yes – this tool is free to use without an account.

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